Improvement in let-off motions of looms



UNITED STATES PATENT OFFICE.

FREDERICK WILLIAM GRAIOHEN, OF PROVIDENCE, RHODE ISLAND, ASSIGNOR TOEDWARD BARROWS AND JOSEPH OLAYTON, OF DRAOUT, MASS.

IMPROVEMENT IN LET-OFF MOTIONS OF LOOMS.

Specication forming part of Letters Patent No. 116,437, dated June 27,1871.

To all whom it may concern:

Be it known that I, FREDERICK WILLIAM GRAICHEN, of the city and countyof Providence,

of the State of Rhode. Island, have invented a new and useful FrictionApparatus for the Yarn Beam of a Loom; and do hereby declare the same tobe fully described in the following speci iication and represented inthe accompanying drawing, of which- Figure l is a top view, Fig. 2 afront elevation, and Fig. 3 a transverse section of it and a yarnbeamand its supporting end of aloom-frame.

In such drawing, A denotes the yarinbeam, and B the loomframe, al beingthe. cross-girt, or that immediately underneath the yarn-beam. Twofriction-straps or bands, O O, attached at one end of each to the girt,extend over and upon the peripheries of the heads b b of the yarn-beam,

and are connected to the eyes of two screws, cc. These screws areextended through two levers, I) D, whose fulcrums d d are at or neartheir outer ends, the two levers being arranged, With respect to 'thegirth, in manner as represented. Within a frame, E, arranged between thetwo levers and fixed to the girt, is a shaft, F, provided with a wheel,G, the shaft, at its outer end, being prismatic to receive a key. Aratchetwheel, H, is also xed to the inner side of the wheel G, andreceives and engages with a pawl, I, pivoted to the upper arm of alever, K, whose fulcrum is the said shaft. A spring, L, fastened at oneend to the lower arm of the lever K, and at the other to the floor, isarranged as represented. Furthermore, two bolts, M N, fastened to theperiphery of the wheel G, are extended partially around the wheel andunderneath guiderollers O O, and are looped upon the inner ends of thetwo levers D D, all being as represented.

The belts and the wheel, the pawl and its lever, combined and arrangedin manner as described and as represented, with the spring in the leversof the friction-bands, constitute a means by which the tension or draftof the spring on the band-levers may be adjusted and regulated, ascircumstances may require.

By casting the belts off the friction-band levers the yarn-beam will beso relieved of the friction of the bands as to enable it to be readilyrevolved by an operative when it may be necessary for him to do so toeffect the piecing up of a warp, or for any other purpose.

I make no claim to the yarn-beam friction apparatus shown and describedin the British patent No. 2,989, for 1868, granted to Gadd and Moore. Mymechanism differs materially therefrom not only in construction, but inhaving but one spring to perform the functions of several springs asemployed in the said Gadd and Moores apparatus. Furthermore, it has aseries of levers, one of which is directly connected with the spring andthe latchlpawl. B y pivoting' the pawl I to the lever K and making useof such lever one spring only becomes necessary to operate the wholemechanism connected with it. Thus I secure one important advantage inconstruction and operation, and, besides, my arrangement greatlysimplifies the mechanism.

I therefore claim- My improved yarn-beam friction apparatus as composedof instrumentalities as described, arranged, and combined as set forth,such instrumentalities consisting of the single spring L, the lever K,the paw] l, the ratchet-Wheel H, the wheel Gr, frame E, the shaft F, thebauds M N, guide-wheels O O, and levers D 1). provided with thefriction-bands C O, applied to the yarnbeam as represented.

F. W. GRAIGHEN.

Witnesses:

R. H. EDDY, J. R. SNOW.

